President Obama has signed the Credit Card Accountability, Responsibility and Disclosure, or Credit CARD, Act of 2009 into law. The legislation will improve consumer disclosures and end some practices in the credit card industry. Most of the provisions took effect Feb. 22, 2010.

Here's an overview of the major changes of the Credit CARD Act of 2009 as interpreted by bankrate.com.

Retroactive rate increases: Issuers can't raise rates on an existing balance unless a promotional rate expired, the variable indexed rate increased or you paid late by 60 days or more. No longer will they be able to punish borrowers for late payments on unrelated accounts under the practice of universal default or due to "anytime, any reason" clauses. If the cardholder does trigger the default rate because of a 60-day delinquency, the bank must restore the lower rate once the cardholder demonstrates six months of consecutive on-time payments.

In general, rates can't be raised in the first year after issuance, and promotional rates must last at least six months. Exceptions include expiration of a promotional rate, termination or completion of a workout plan, a change in the index rate or a 60-day delinquency. Cardholders will still need to read correspondence from their creditors.

More advance notice of rate hikes: Consumers get 45 days' notice before key contract changes take effect, including rate increases. Under the current Truth in Lending Act, cardholders only receive a 15-day heads up. This provision doesn't apply to credit limit changes. The new rules also don't cap interest rates. The increased rate can still be triple your existing APR.

Fee Restrictions: Cardholders will not face over limit fees unless they elect to allow the creditor to approve over limit transactions. Issuers can't charge more than one over limit fee per billing cycle. In general, banks can't charge consumers a fee to pay their credit card debt, a cost some cardholders encounter for payments made by telephone or Internet. They can impose a fee to expedite a payment. Payments received by the due date -- or the next business day, if the bank doesn't accept mailed payments on the due date -- won't trigger a late fee. If the cardholder pays at a local branch, the payment must be credited the same day.

Restricts marketing and issuance to students: Consumers who can't prove an independent means of income or provide the signature of a co-signer aged 21 or older won't get approved for credit cards. The provision protects young people who lack the means or the knowledge to handle credit cards.

Ends double-cycle billing: The new law bans double-cycle billing, the practice of basing finance charges on the current and previous balance.

Under this method, the issuer could charge interest on debt already paid off the previous month.

Fairer payment allocation: A close look at your card agreement will likely reveal a clause that explains that payments will be applied to lower-rate balances first. Not so anymore. The Credit CARD Act requires above-the-minimum payments to be applied first to the credit card balance with the highest interest rate.

More time to pay: Card companies must send statements 21 days before a payment is due. Current law requires a mere 14 days' notice.

Gift card protections: The legislation includes protections for gift cardholders. The new law prohibits gift cards from expiring for at least five years.